ENERGY AND EXERGY ANALYSIS OF DRY-STEAM GEOTHERMAL POWER PLANT IN KAMOJANG

Keywords

Dry steam, geothermal power plant, exergy, irreversibility

Abstract

The dry-steam geothermal in Kamojang is one of the biggest
power plants in Indonesia with an installed capacity of 235 MW.
This capacity was raised by ﬁve units of the power house, such
as Unit 1 with a capacity of 30 MW, Units 2 and 3 each with
55 MW, 60 MW for Unit 4, and 35 MW for Unit 5. The Kamojang
reservoir is considered as the best vapour-dominated reservoir in
Indonesia with a temperature of 245◦C. This research is aimed
at calculating the rate of energy and exergy of Unit 3 using the
engineering equation solver. The calculation requires the parameter,
temperature, pressure, and mass ﬂow rate which are obtained from
daily plant data operation. Our observation showed that the ﬁrst
law of thermodynamic eﬃciency in Unit 3 of the Kamojang plant
had reached 23.21%. The total exergy entering the system is at
295,789 kW. The exergy that can be converted into electrical energy
is 100,863 kW with the second law of thermodynamic eﬃciency
the plant had reached 34.10%. The biggest irreversibility occurs
in the condenser reaching 178,190 kW or 60.24% of the total
availability. Steam receiving header is the component with the
smallest irreversibility with 264.2 kW or 0.09% of the total available
exergy.